(20 U.S.C. 6301 et. seq.), as amended by this Act, from programs. authorized under the Elementary and Secondary Education Act. of 1965 (20 U.S.C. 6301 et seq.), as in effect on the day before. the date of enactment of this Act.
The efficacy of a vaccine is different from its effectiveness. It is dependent on several factors such as: 1  adherence to vaccine schedules. 2  the disease â some diseases have vaccines against them that perform better than for other diseases. 3  the strain of vaccine â some vaccine strains are more effective than others.
There are 4 main types of vaccines: 1  live attenuated vaccines, which contain a living, but weakened, form of the germ (organism); 2  inactivated vaccines, which contain a killed form of the organism; 3  subunit vaccines, which contain just the part of the organism that stimulates an immune response (the antigen); and.n antigen specifically induces the production of antibodies which can bind to it and neutralise it. While most vaccines work by inducing B lymphocytes to produce antibodies (see below), activation of T-cells â another type of immune system cell that helps protect against disease â is also important for some vaccines.